PLATE CXXI. 



the fame fpecies as our shell. That author says it is the size of a 

 hazel nut, from which it appears the fpecimen he faw was a young 

 Shell ; the largest of our specimens being of the size represented in 

 the annexed Plate. 



This is Venus lactea of some cabinets, a name sufficiently ex- 

 pressive of its colour, but having been before called Undata by- 

 Pennant, we thought it best to retain the name he had given it. 



